463 lines
10 KiB
JavaScript
463 lines
10 KiB
JavaScript
//---------------------------------------------------------------------
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// QRCode for JavaScript
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//
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// Copyright (c) 2009 Kazuhiko Arase
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//
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// URL: http://www.d-project.com/
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//
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// Licensed under the MIT license:
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// http://www.opensource.org/licenses/mit-license.php
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//
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// The word "QR Code" is registered trademark of
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// DENSO WAVE INCORPORATED
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// http://www.denso-wave.com/qrcode/faqpatent-e.html
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//
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//---------------------------------------------------------------------
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// Modified to work in node for this project (and some refactoring)
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//---------------------------------------------------------------------
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var QR8bitByte = require('./QR8bitByte');
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var QRUtil = require('./QRUtil');
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var QRPolynomial = require('./QRPolynomial');
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var QRRSBlock = require('./QRRSBlock');
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var QRBitBuffer = require('./QRBitBuffer');
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function QRCode(typeNumber, errorCorrectLevel) {
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this.typeNumber = typeNumber;
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this.errorCorrectLevel = errorCorrectLevel;
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this.modules = null;
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this.moduleCount = 0;
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this.dataCache = null;
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this.dataList = [];
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}
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QRCode.prototype = {
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addData : function(data) {
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var newData = new QR8bitByte(data);
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this.dataList.push(newData);
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this.dataCache = null;
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},
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isDark : function(row, col) {
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if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) {
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throw new Error(row + "," + col);
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}
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return this.modules[row][col];
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},
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getModuleCount : function() {
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return this.moduleCount;
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},
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make : function() {
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// Calculate automatically typeNumber if provided is < 1
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if (this.typeNumber < 1 ){
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var typeNumber = 1;
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for (typeNumber = 1; typeNumber < 40; typeNumber++) {
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var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, this.errorCorrectLevel);
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var buffer = new QRBitBuffer();
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var totalDataCount = 0;
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for (var i = 0; i < rsBlocks.length; i++) {
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totalDataCount += rsBlocks[i].dataCount;
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}
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for (var x = 0; x < this.dataList.length; x++) {
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var data = this.dataList[x];
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buffer.put(data.mode, 4);
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buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber) );
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data.write(buffer);
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}
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if (buffer.getLengthInBits() <= totalDataCount * 8)
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break;
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}
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this.typeNumber = typeNumber;
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}
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this.makeImpl(false, this.getBestMaskPattern() );
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},
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makeImpl : function(test, maskPattern) {
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this.moduleCount = this.typeNumber * 4 + 17;
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this.modules = new Array(this.moduleCount);
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for (var row = 0; row < this.moduleCount; row++) {
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this.modules[row] = new Array(this.moduleCount);
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for (var col = 0; col < this.moduleCount; col++) {
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this.modules[row][col] = null;//(col + row) % 3;
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}
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}
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this.setupPositionProbePattern(0, 0);
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this.setupPositionProbePattern(this.moduleCount - 7, 0);
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this.setupPositionProbePattern(0, this.moduleCount - 7);
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this.setupPositionAdjustPattern();
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this.setupTimingPattern();
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this.setupTypeInfo(test, maskPattern);
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if (this.typeNumber >= 7) {
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this.setupTypeNumber(test);
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}
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if (this.dataCache === null) {
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this.dataCache = QRCode.createData(this.typeNumber, this.errorCorrectLevel, this.dataList);
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}
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this.mapData(this.dataCache, maskPattern);
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},
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setupPositionProbePattern : function(row, col) {
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for (var r = -1; r <= 7; r++) {
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if (row + r <= -1 || this.moduleCount <= row + r) continue;
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for (var c = -1; c <= 7; c++) {
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if (col + c <= -1 || this.moduleCount <= col + c) continue;
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if ( (0 <= r && r <= 6 && (c === 0 || c === 6) ) ||
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(0 <= c && c <= 6 && (r === 0 || r === 6) ) ||
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(2 <= r && r <= 4 && 2 <= c && c <= 4) ) {
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this.modules[row + r][col + c] = true;
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} else {
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this.modules[row + r][col + c] = false;
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}
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}
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}
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},
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getBestMaskPattern : function() {
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var minLostPoint = 0;
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var pattern = 0;
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for (var i = 0; i < 8; i++) {
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this.makeImpl(true, i);
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var lostPoint = QRUtil.getLostPoint(this);
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if (i === 0 || minLostPoint > lostPoint) {
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minLostPoint = lostPoint;
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pattern = i;
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}
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}
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return pattern;
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},
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createMovieClip : function(target_mc, instance_name, depth) {
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var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth);
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var cs = 1;
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this.make();
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for (var row = 0; row < this.modules.length; row++) {
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var y = row * cs;
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for (var col = 0; col < this.modules[row].length; col++) {
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var x = col * cs;
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var dark = this.modules[row][col];
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if (dark) {
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qr_mc.beginFill(0, 100);
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qr_mc.moveTo(x, y);
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qr_mc.lineTo(x + cs, y);
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qr_mc.lineTo(x + cs, y + cs);
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qr_mc.lineTo(x, y + cs);
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qr_mc.endFill();
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}
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}
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}
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return qr_mc;
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},
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setupTimingPattern : function() {
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for (var r = 8; r < this.moduleCount - 8; r++) {
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if (this.modules[r][6] !== null) {
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continue;
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}
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this.modules[r][6] = (r % 2 === 0);
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}
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for (var c = 8; c < this.moduleCount - 8; c++) {
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if (this.modules[6][c] !== null) {
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continue;
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}
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this.modules[6][c] = (c % 2 === 0);
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}
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},
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setupPositionAdjustPattern : function() {
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var pos = QRUtil.getPatternPosition(this.typeNumber);
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for (var i = 0; i < pos.length; i++) {
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for (var j = 0; j < pos.length; j++) {
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var row = pos[i];
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var col = pos[j];
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if (this.modules[row][col] !== null) {
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continue;
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}
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for (var r = -2; r <= 2; r++) {
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for (var c = -2; c <= 2; c++) {
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if (Math.abs(r) === 2 ||
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Math.abs(c) === 2 ||
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(r === 0 && c === 0) ) {
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this.modules[row + r][col + c] = true;
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} else {
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this.modules[row + r][col + c] = false;
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}
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}
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}
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}
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}
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},
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setupTypeNumber : function(test) {
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var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
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var mod;
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for (var i = 0; i < 18; i++) {
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mod = (!test && ( (bits >> i) & 1) === 1);
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this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
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}
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for (var x = 0; x < 18; x++) {
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mod = (!test && ( (bits >> x) & 1) === 1);
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this.modules[x % 3 + this.moduleCount - 8 - 3][Math.floor(x / 3)] = mod;
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}
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},
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setupTypeInfo : function(test, maskPattern) {
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var data = (this.errorCorrectLevel << 3) | maskPattern;
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var bits = QRUtil.getBCHTypeInfo(data);
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var mod;
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// vertical
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for (var v = 0; v < 15; v++) {
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mod = (!test && ( (bits >> v) & 1) === 1);
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if (v < 6) {
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this.modules[v][8] = mod;
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} else if (v < 8) {
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this.modules[v + 1][8] = mod;
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} else {
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this.modules[this.moduleCount - 15 + v][8] = mod;
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}
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}
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// horizontal
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for (var h = 0; h < 15; h++) {
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mod = (!test && ( (bits >> h) & 1) === 1);
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if (h < 8) {
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this.modules[8][this.moduleCount - h - 1] = mod;
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} else if (h < 9) {
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this.modules[8][15 - h - 1 + 1] = mod;
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} else {
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this.modules[8][15 - h - 1] = mod;
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}
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}
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// fixed module
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this.modules[this.moduleCount - 8][8] = (!test);
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},
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mapData : function(data, maskPattern) {
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var inc = -1;
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var row = this.moduleCount - 1;
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var bitIndex = 7;
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var byteIndex = 0;
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for (var col = this.moduleCount - 1; col > 0; col -= 2) {
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if (col === 6) col--;
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while (true) {
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for (var c = 0; c < 2; c++) {
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if (this.modules[row][col - c] === null) {
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var dark = false;
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if (byteIndex < data.length) {
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dark = ( ( (data[byteIndex] >>> bitIndex) & 1) === 1);
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}
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var mask = QRUtil.getMask(maskPattern, row, col - c);
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if (mask) {
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dark = !dark;
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}
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this.modules[row][col - c] = dark;
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bitIndex--;
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if (bitIndex === -1) {
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byteIndex++;
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bitIndex = 7;
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}
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}
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}
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row += inc;
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if (row < 0 || this.moduleCount <= row) {
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row -= inc;
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inc = -inc;
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break;
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}
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}
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}
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}
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};
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QRCode.PAD0 = 0xEC;
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QRCode.PAD1 = 0x11;
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QRCode.createData = function(typeNumber, errorCorrectLevel, dataList) {
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var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
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var buffer = new QRBitBuffer();
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for (var i = 0; i < dataList.length; i++) {
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var data = dataList[i];
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buffer.put(data.mode, 4);
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buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber) );
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data.write(buffer);
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}
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// calc num max data.
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var totalDataCount = 0;
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for (var x = 0; x < rsBlocks.length; x++) {
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totalDataCount += rsBlocks[x].dataCount;
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}
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if (buffer.getLengthInBits() > totalDataCount * 8) {
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throw new Error("code length overflow. (" +
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buffer.getLengthInBits() +
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">" +
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totalDataCount * 8 +
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")");
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}
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// end code
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if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
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buffer.put(0, 4);
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}
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// padding
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while (buffer.getLengthInBits() % 8 !== 0) {
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buffer.putBit(false);
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}
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// padding
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while (true) {
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if (buffer.getLengthInBits() >= totalDataCount * 8) {
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break;
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}
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buffer.put(QRCode.PAD0, 8);
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if (buffer.getLengthInBits() >= totalDataCount * 8) {
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break;
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}
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buffer.put(QRCode.PAD1, 8);
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}
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return QRCode.createBytes(buffer, rsBlocks);
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};
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QRCode.createBytes = function(buffer, rsBlocks) {
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var offset = 0;
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var maxDcCount = 0;
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var maxEcCount = 0;
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var dcdata = new Array(rsBlocks.length);
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var ecdata = new Array(rsBlocks.length);
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for (var r = 0; r < rsBlocks.length; r++) {
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var dcCount = rsBlocks[r].dataCount;
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var ecCount = rsBlocks[r].totalCount - dcCount;
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maxDcCount = Math.max(maxDcCount, dcCount);
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maxEcCount = Math.max(maxEcCount, ecCount);
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dcdata[r] = new Array(dcCount);
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for (var i = 0; i < dcdata[r].length; i++) {
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dcdata[r][i] = 0xff & buffer.buffer[i + offset];
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}
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offset += dcCount;
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var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
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var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);
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var modPoly = rawPoly.mod(rsPoly);
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ecdata[r] = new Array(rsPoly.getLength() - 1);
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for (var x = 0; x < ecdata[r].length; x++) {
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var modIndex = x + modPoly.getLength() - ecdata[r].length;
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ecdata[r][x] = (modIndex >= 0)? modPoly.get(modIndex) : 0;
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}
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}
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var totalCodeCount = 0;
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for (var y = 0; y < rsBlocks.length; y++) {
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totalCodeCount += rsBlocks[y].totalCount;
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}
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var data = new Array(totalCodeCount);
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var index = 0;
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for (var z = 0; z < maxDcCount; z++) {
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for (var s = 0; s < rsBlocks.length; s++) {
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if (z < dcdata[s].length) {
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data[index++] = dcdata[s][z];
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}
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}
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}
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for (var xx = 0; xx < maxEcCount; xx++) {
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for (var t = 0; t < rsBlocks.length; t++) {
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if (xx < ecdata[t].length) {
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data[index++] = ecdata[t][xx];
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}
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}
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}
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return data;
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};
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module.exports = QRCode;
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